Plotting Multiple Function Curves to Same Graphic in R (2 Examples)

In this tutorial you’ll learn how to print several functions to the same graphic in R programming.

Example 1: Using Base R to Draw Several Curves to Same Plot

fn_1 <- function(x) {                     # Creating three user-defined functions
  x^4 * 3 - x^3 - x^2 * 00 - 2 * 10^15
}
fn_2 <- function(x) {
  x^4 * 20 + x^2 + x * 70
}
fn_3 <- function(x) {
  x^4 - x^3 * 500 - x^2 * 150 + 2 * 10^15
}
curve(fn_1,                               # Plotting curves in Base R
      from = - 7500,
      to = 7500,
      col = 2)
curve(fn_2,
      from = - 7500,
      to = 7500,
      col = 3,
      add = TRUE)
curve(fn_3,
      from = - 7500,
      to = 7500,
      col = 4,
      add = TRUE)

r graph figure 1 plotting multiple function curves same graphic r

Example 2: Using ggplot2 Package to Draw Several Curves to Same Plot

install.packages("ggplot2")               # Install ggplot2 package
library("ggplot2")                        # Load ggplot2 package
data_fn <- data.frame(x = - 7500:7500,    # Constructing data frame
                      y = c(fn_1(- 7500:7500),
                            fn_2(- 7500:7500),
                            fn_3(- 7500:7500)),
                      functions = rep(c("function No.1",
                                        "function No.2",
                                        "function No.3"),
                                      each = 15001))
ggplot(data_fn,                           # Plotting curves with ggplot2
       aes(x = x,
           y = y,
           col = functions)) +
  geom_line()

r graph figure 2 plotting multiple function curves same graphic r

Related Tutorials & Further Resources

In the following, you may find some additional resources on topics such as lines, variables, and graphics in R.

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